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  <title>Performs a tcpwrap check</title>
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  <div id="layout-content"><div id="function.tcpwrap-check" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">tcpwrap_check</h1>
  <p class="verinfo">(PECL tcpwrap &gt;= 0.1.0)</p><p class="refpurpose"><span class="refname">tcpwrap_check</span> &mdash; <span class="dc-title">Performs a tcpwrap check</span></p>

 </div>
 <div class="refsect1 description" id="refsect1-function.tcpwrap-check-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>tcpwrap_check</strong></span>
    ( <span class="methodparam"><span class="type">string</span> <code class="parameter">$daemon</code></span>
   , <span class="methodparam"><span class="type">string</span> <code class="parameter">$address</code></span>
   [, <span class="methodparam"><span class="type">string</span> <code class="parameter">$user</code></span>
   [, <span class="methodparam"><span class="type">bool</span> <code class="parameter">$nodns</code><span class="initializer"> = <strong><code>FALSE</code></strong></span></span>
  ]] ) : <span class="type">bool</span></div>

  <p class="para rdfs-comment">
   This function consults the <var class="filename">/etc/hosts.allow</var> and 
   <var class="filename">/etc/hosts.deny</var> files to check if access to service 
   <code class="parameter">daemon</code> should be granted or denied for a client.
  </p>
 </div>

 <div class="refsect1 parameters" id="refsect1-function.tcpwrap-check-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    
     <dt>
<code class="parameter">daemon</code></dt>

     <dd>

      <p class="para">
       The service name.
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">address</code></dt>

     <dd>

      <p class="para">
       The client remote address. Can be either an IP address or a domain name.
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">user</code></dt>

     <dd>

      <p class="para">
       An optional user name.
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">nodns</code></dt>

     <dd>

      <p class="para">
       If <code class="parameter">address</code> looks like domain name then DNS is 
       used to resolve it to IP address; set <code class="parameter">nodns</code> to 
       <strong><code>TRUE</code></strong> to avoid this.
      </p>
     </dd>

    
   </dl>

  </p>
 </div>

 <div class="refsect1 returnvalues" id="refsect1-function.tcpwrap-check-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   This function returns <strong><code>TRUE</code></strong> if access should be granted, <strong><code>FALSE</code></strong> otherwise.
  </p>
 </div>

 <div class="refsect1 examples" id="refsect1-function.tcpwrap-check-examples">
  <h3 class="title">范例</h3>
  <div class="example" id="example-5678">
   <p><strong>Example #1 Deny all connections from localhost</strong></p>
   <div class="example-contents"><p>
    If your <var class="filename">/etc/hosts.deny</var> file contains:
   </p></div>
   <div class="example-contents screen">
<div class="examplescode"><pre class="examplescode">php: 127.0.0.1</pre>
</div>
   </div>
   <div class="example-contents"><p>
    And your code looks like:
   </p></div>
   <div class="example-contents">
<div class="phpcode"><pre><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /></span><span style="color: #007700">if&nbsp;(!</span><span style="color: #0000BB">tcpwrap_check</span><span style="color: #007700">(</span><span style="color: #DD0000">'php'</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$_SERVER</span><span style="color: #007700">[</span><span style="color: #DD0000">'REMOTE_ADDR'</span><span style="color: #007700">]))&nbsp;{<br />&nbsp;&nbsp;die(</span><span style="color: #DD0000">'You&nbsp;are&nbsp;not&nbsp;welcome&nbsp;here'</span><span style="color: #007700">);<br />}<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</pre></div>
   </div>

  </div>
 </div>

 <div class="refsect1 seealso" id="refsect1-function.tcpwrap-check-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   For more details please consult hosts_access(3) man page.
  </p>
 </div>

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